Display briefcase



FIG. 1 is a front elevational view of a display briefcase showing my new design;

FIG. 2 is a right side perspective view thereof in open flat position;

FIG. 3 is a top perspective view thereof;

FIG. 4 is a right side perspective view thereof in an expanded display position;

FIG. 5 is a right side perspective view thereof is a upright display position;

FIG. 6 is a left side perspective view thereof. 

The ornamental design for a display briefcase, as shown and described. 